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@uitga gieten guttnt @ffice T. J. BOWDLE, S. R. LAWDER, AND F. JOHNSTON,OF PIQUA, OHIO.

Lettersv Patent No. 82,792, dated October 6, 1868.

IMPROVEMENT IN MACHINES FOR TENONING BLIND-SLATS.

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TO ALLWHOM IT MAY OONCERN:

Be it known that we, T. J. BowDLE, S. LAWDER, and F. E. JOHNSTON, of.Piqua, in the county of Miami, and State of Ohio, have invented a newand' improved Machine for Tenoning Blind-Sluts; and we do hereby declarethe `following to be a full and exact description thereof, referencebeing had to the accompanying drawings, forming a part of thisspecification, in whichl Figure 1 isla plan view of our blind-slettenoner, with movements thereof illustratedin red lines.

Figure 2, a plan view of the same reversed, showing the undersidethereof, having -also an illustration of its movement in redA lines. I

Figure 3, a section in the line a: z, and l Figure 4 a section in line yy of iig. 1.

Similar letters indicate like parts in each oi' the figures. v

The nature-of our invention consists in the combinationof a T-sbapedcentrally-pivoted 1ever,4with suitable toggle-joint levers, for thepurpose of moving a pair of sliding bits or cutters to and from eachother, so as to cut and form the shoulders upon the end of ablind-slat.

Also, in causing, by means of a suitable link connecting the T-shapedvibrating lever lwith a-collar actuating a sliding tubular centre-bit,an approach of said tubular bit simultaneously with the approach of the4 shoulder-bits, to cgt and form a journal upon the end of the slat. i

Also, in imparting'a rotary movement to said tubular bit, in -itsapproach to the slat, by means of a pin in the box or collar supportingthe bit engaging a spiral groove on the periphery thereof, or viceversa.

To enable others skilled in lthe art to-make and use this our invention,we will proceed to describe its construction and operation.

VUpon a suitable table or bed-pla te, A, we secure, in a right line,ways B B B Bj, igs. 1 and 3, between which the carriages or stocks C C,which carry the shoulder-bits or cutters A A, slide freely. v

An interval is left between the opposite ends of the ways, sufficient toallow the introduction of the -slat to be tenoned, and of the devicesfor securing the same, as seen in fig. 1.

To each carriage, C, is secured an arm, D, (see iig. 3,) projectingdownward through a slot cut in the table between the ways B and B', ofsuch a length as-to permit the extent of. movement required in thebit-carriages C. These arms D, instead of being fastened immovably tothe carriages C, pass-through slots, b, therein, and

are secured at any desired 'point along the slots by means of set-screwsc, so as to permit an adjustment of the carriages with reference to 'thelevers connected to said arms D, as hereinafter described.

At right angles to the ways B B B B', and in a line central between thcoppositencnds thereof, we support, in suitable boxes, E E, a tubularbit, F, so that vitmay not only s'lide freely back and forth, but alsorevolve therein.

A loose collar, G, having an arm, H, iig. 2, projecting downward througha slot, cl, cutin the table in theA line of movement of the bit,encircles the same midway between its bearings at .E E, and is held inplace by adjusting-rings I, fig. 1, secured to the-bit, on either sideofthe collar, by means of set-screws In a right line with said tubularbit, and on the opposite side of4 the bit-carriages C C, is placed asupportingblock, K, to hold the end of the slat to'b'e-tenoned, (seeslat in red lines, g. 1,) secured by a clamp, f, -sliding in a slot, y,fig. 1, in the table beneath, which permits its adjustment at a properdistance from the bits. This block is fitted with guide-pieces' andset-screws to hold and secure the end of the slat in a proper positionwhilst the bits a are cutting the same. I I

Provision is also made for the support of the other end of the slat,vbymeans of a second block, K', seciired also by a clamp'sliding in thesame slot g, which is extended for the purpose to the outer-edge ofthetable, and provided withsuitable retaining-devices and set-screws.

A carriage, L, is arranged to slide vertically in Ways t t, iig. 2,against the end of the table at the termination ofthe slot g, in whichis formed a groove, g', to receivethe clamp ofthe rear block Ki, so thatthe block may slide along the slotg into the groove g of 4the carriageL, and be' elevated vertically whenever the character of the workrequires that the slat be inclined whilst being tenoncrl.v

A bent T-shapedlever, P, iig. 2, is pivoted centrally to the under sideof the table, so that its pivot, h, shall be at the intersection oftheaxis of the tubular bit with the line of movement of the shoulder-bits.The long arm K of the lever P extends out beyond the side of the table,and forms a handle wherewith to-vibrate the same.

To the end of each of the shorter arms, 19'21", of the lever is pvoted ashort link, M-M, extending to a toggle-joint formed by two short leversN N, the one Vpivot-ed to the tablc, and thc other to a,plate on the rodor arm D, extending through the slot from the shoulder-bit carriageabove, the shorter arms p p, of the lever extending in oppositedirections, being so bent as to `projectV respectively on opposite sidesof the. line of the slots beneath the bit-carriages C C, (see dottedlines, fig. l.) Hence, by vibrating the long arm p, oftheilcver P, theshorter arms p'p,rocking or swinging upon the pivot L of' the lever,will double the toggle-joints N N; andthus cause the carriages C C toslide in their ways.

The adjustment of the toggle-levers N with the actuating-lever P andwith the sliding carriages C, is so made as that the hits a shall beclosed upon the slat when the toggle-levers are straight, so that avibration ot' the lever P in either direction will, bybcnding'tllejoints.l cause the bits to separate.

The movements ol' the lever P may be so controlled as to allow it topass beyond the dead-point ofl the toggles, (as illustrated by redlines, fig. 2,) so as to cause, by the continued movement of the leverin one direction, a slight withdrawal of the shoulder-bits after theyhaveclosed, and, upon its reversal, to cause them to close again beforethey are finally separated after cutting the shoulders upon the slat. l

To obtain an approach of the tubular centre-bit simultaneously with theclosing of the shoulder-bitsa a, we connect the arm H, projecting fromthe collar G thereon, with one arm, p', of the lever P," by means of apivoted link, R, so adjusting the link asthat the tubular 'hit F shalladvance towards the end of the slat at the same time that the side bitsa are closing to eut thc shoulders thereon. Where amovcuicnt ot'the'lever P, to i push the toggle-levers N beyond their right line ordead-point, as illustrated in red lines, fig. 2, is allowed, so as tocause the bits a to withdraw again slightly' after closing the tubularbit will still continue to advance steadily until the lever P isreversed.

This combination and adjustment ofthe lever P with the toggle-levers Nis desirable, inasmuch as the side bits a, closing once more upon theshoulders previously cut on the slat before they' are entirely withdrawntherefrom, will give a finish thereto, removing all roughness orimperfection therefrom.

A pin, sg. `4, in the inner periphery of the front box or collar E ofthe tubular bit, engagesin a spiral groove, t, cut on the outer surfaeeof said bit, so that as the bit moves forward it is made torevolve slowly in its bearings within the boxes E. l

The rings I, held by set-screws z'z'on either side of' the loose collarG, permit an adjustment of the bit to or from the shoulder-bits a. Theseare held in their stocks or carriages C by suitable ser-screws v.

The carriages C are themselves adjustable by means of the arms D in theslots Z1 of the carriages.

Having thus fully describcdour invention, we claim therein as new, anddesire to secure by Letters Patent- 1. A T-shaped vibrating lever P, incombination with toggle-joint levers NnN, suitable connecting-linksM.M,- and with sliding carriages C C, carrying the shoulder-cutting bitsa a of a slat-tenoning machine, all arranged and operating substantiallyas and for the purpose herein set forth. i

2. In combination with the foregoing devices, combining with one arm,p', of said vibrating lever P, a connecting-link R, pivoted to a collar,Gr, embracing the tubular centre-bit' F of the machine for the purposeof operating the same, all substantially as is herein specified. i

T. J. BOWDLE.

S. R. LAWDER. Witnesses; F. E. JOHNSTON.

WM. WHITE,

J. F. McKINNEY.

